Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsShinji Katagiri, Masaru Shimura, Hideo Nanataki, Shinsuke Kobayashi, Kiyoto Toyoizumi, Yasunari Watanabe, Hideaki Hasegawa
Life of this patent
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Abstract
The image forming apparatus includes a photosensitive drum and a light emitting device. In the rotational axis direction of the photosensitive drum, the width of the weak light exposure region on the photosensitive drum in which an exposing device emits weak light is larger than the width of a region corresponding to the width of a recording medium on which an image is formed, but smaller than the width of a region on the photosensitive drum charged by a charging roller.
Claims19
An image forming apparatus that forms a latent image by exposing a photosensitive member charged by a charging device and that develops the latent image with toner to form a toner image on a recording medium, comprising:
- a light emitting device that emits normal light onto a printable region on the photosensitive member charged by the charging device to form the latent image;
- and
- a control unit configured to cause the light emitting device to emit weak light whose light amount is smaller than a light amount of the normal light,
- wherein with regard to the rotational axis direction of the photosensitive member, the control unit causes the light emitting device to emit weak light onto a weak light onto a weak light exposure region on the photosensitive member outside the printable region in a region corresponding to the recording medium on the photosensitive member,
- wherein with regard to the rotational axis direction, both outer borders of the weak light exposure region on the photosensitive member are respectively positioned outside both outer borders of the region corresponding to the recording medium on the photosensitive member and inside both outer borders of a charging region charged by the charging device on the photosensitive member, and
- wherein with regard to the rotational axis direction, a region on the photosensitive member inside the charging region and outside the weak light exposure region constitutes a light emission prohibition region in which light emission is prohibited.
An image forming apparatus that forms a latent image by exposing a photosensitive member charged by a charging device and that develops the latent image with toner to form a toner image on a recording medium, comprising:
- a light emitting device that emits normal light onto a printable region on the photosensitive member charged by the charging device to form a latent image;
- and
- a control unit configured to cause the light emitting device to emit weak light whose light amount is smaller than a light amount of the normal light,
- wherein with regard to the conveyance direction of the recording medium, the control unit causes the light emitting device to emit weak light to a weak light exposure region on the photosensitive member outside the printable region in a region corresponding to the recording medium on the photosensitive member, and
- wherein with regard to the conveyance direction of the recording medium, both outer borders of the weak light exposure region are respectively positioned outside both outer borders of the regions corresponding to the recording medium on the photosensitive member.
Dependencies are inferred from the claim text.